var img1 = new Image();
img1.src = '../_images/o-firme.gif';
var img1_on = new Image();
img1_on.src = '../_images/o-firme_on.gif';

var img2 = new Image();
img2.src = '../_images/kontakty.gif';
var img2_on = new Image();
img2_on.src = '../_images/kontakty_on.gif';

var img3 = new Image();
img3.src = '../_images/reference.gif';
var img3_on = new Image();
img3_on.src = '../_images/reference_on.gif';

var img4 = new Image();
img4.src = '../_images/mik.gif';
var img4_on = new Image();
img4_on.src = '../_images/mik_on.gif';

var img5 = new Image();
img5.src = '../_images/reklama.gif';
var img5_on = new Image();
img5_on.src = '../_images/reklama_on.gif';

var img6 = new Image();
img6.src = '../_images/pik.gif';
var img6_on = new Image();
img6_on.src = '../_images/pik_on.gif';